YITH WooCommerce Pre-Order Premium 2.23.2

* New: Support for WooCommerce 4.7
* Update: Plugin framework
* Update: Language files

* New: Support for WooCommerce 4.6
* Update: Plugin framework
* Update: Language files

* New: Support for WordPress 5.5
* New: Support for WooCommerce 4.5
* Update: Plugin framework
* Update: Language files
* Fix: crossed out price issue when using bulk action
* Fix: download links for variations weren't being hidden
* Fix: Product released e-mail was sent even if order is canceled